Parker PLLC Installation Information

Parker PLLC Installation Information Manual pdf 1 page image

Refrigerating Specialties Division 1ProgrammableLiquid Level ControllerType PLLCFor use with ITP Depth Tracker transducerliquid level probePurpose:The Programmable Liquid Level Control provides remoteliquid level management for industrial refrigeration. ThePLLC is designed for use specifically with Parker's ITPDepth Tracker transducer liquid level probe. The PLLCprovides the power source for the current loop of theITP. The ITP probe is used to provide a current signalproportional to the vertical liquid level in a standpipe orvessel. The PLLC serving as a switching mechanism alsoconverts the return signal and performs up to 5 program-mable relay functions.Bulletin 61-50BType PLLCOctober 2006Installation Information309317Keypad Programmable Level Setting Procedure• Supply power to the PLLC. All 4 digits will light for asecond then count down 1-4 from left to right. If there isno level in the vessel or the probe is disconnected, thedisplay should read 00• Push the "Channel" button once. The LED will displaythe Channel, Mode (Relay Disposition) and the ActualLevel Set-point.• Use the "Up" and "Down" arrow keys to select the set-point for this level.• Press the "Enter" key, you will hear a BEEP that willconfirm your setting.• Channels 1, 4, and 5 are programmed using the sameprocedure.• Channel 2 is capable of operation as an additionaldifferential level control or it can be set to operate analarm function.• Differential Level Control: Follow the same procedureused in setting channel 3.• Alarm: In order for Channel 2 to be used as an alarm,a differential must be set using the High and Low levelsettings of this channel.• Push the Channel button on the keypad until Channel2 and Mode L is displayed. Using the arrow keys, setthe low level to represent 2% of Full Scale (Full Scale =100%) lower than the actual level setting required andpress the enter key.• Example: If 80% is required for Channel 2 setpoint, setthe channel 2 Low setting for 78%.• Push the channel button again to display Channel 2and Mode H. Now set the High Level setting requiredfor this channel and press Enter.• Note: 2% is the smallest value that can be en-tered. Larger differentials can be used to allow highliquid levels in the vessel to return to a safe operatingWiring:The separable terminal blocks on the PLLC will accom-modate up to 14 gage wire. The Line Voltage Input canbe either 120/240V 60Hz or 110/220V 50Hz. The PLLCprovides the power source for the current loop of thetransducer probe. The programmable relays are indi-vidually 5 amp fused. Relays are equipped with normallyopen and closed terminals and can be wired as either.The maximum recommended distance between PLLC andprobe is 5000 ft.Fig.1CHANNEL 1 HIGH REDCHANNEL 2 LEVEL CONTROLCHANNEL 3 LEVEL CONTROLCHANNEL 4 LOW GREENCHANNEL 5 LOW REDI S O 9 0 0 0 - 2 0 0 0 C E R T I F I E DSTRAIN RELIEF1" CONDUIT KNOCKOUTPLLC

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